X18, B15, E12, I9, L6, P3
B15 will come in the place of question mark (?) in the following sequence so that it will complete the sequence.
Explanation:
- Each element has one alphabet and one number.
- Alphabets are arranged in one manner and numbers are arranged in one manner.
1. The pattern of arrangement of the Alphabets:
X, ?, E, I, L, P
In alphabetic order ,⇒X= 24, E=5, I=9, L = 12, P=16
Therefore, ⇒ 24, ?,5, 9, 12, 16.
The pattern of arrangement is +4, +3, +4, +3 ...
? = 2 which is B in alphabetic order
2. The pattern of arrangement of the numbers:
18, ?, 12, 9, 6, 3
The pattern of arrangement is -3, -3, -3, -3...
? = 15.
This alphabet and number is combined as B15